Federal Reserve Bank of Chicago. "March 31, 1921," Business Conditions (Federal Reserve Bank of Chicago) (March 31, 1921). https://fraser.stlouisfed.org/title/5562/item/574423, accessed on April 25, 2024.
Federal Reserve Bank of Chicago. "March 31, 1921," Business Conditions (Federal Reserve Bank of Chicago) (March 31, 1921). https://fraser.stlouisfed.org/title/5562/item/574423, accessed on April 25, 2024.